Rustlings_primitivetypes

练习过程中的随手记,很多问题也未深究,,简单问题可能直接贴改完之后的代码,..分享出来,若能帮助大家,意外乐趣

primitive_types1

// primitive_types1.rs
// Fill in the rest of the line that has code missing!
// No hints, there's no tricks, just get used to typing these :)


fn main() {
    // Booleans (`bool`)

    let is_morning = true;
    if is_morning {
        println!("Good morning!");
    }

    let is_evening = false;// Finish the rest of this line like the example! Or make it be false!
    if is_evening {
        println!("Good evening!");
    }
}

primitive_types2.rs

// primitive_types2.rs
// Fill in the rest of the line that has code missing!
// No hints, there's no tricks, just get used to typing these :)


fn main() {
    // Characters (`char`)

    let my_first_initial = 'C';
    if my_first_initial.is_alphabetic() {
        println!("Alphabetical!");
    } else if my_first_initial.is_numeric() {
        println!("Numerical!");
    } else {
        println!("Neither alphabetic nor numeric!");
    }

    let your_character = 'A';
    // Finish this line like the example! What's your favorite character?
    // Try a letter, try a number, try a special character, try a character
    // from a different language than your own, try an emoji!
    if your_character.is_alphabetic() {
        println!("Alphabetical!");
    } else if your_character.is_numeric() {
        println!("Numerical!");
    } else {
        println!("Neither alphabetic nor numeric!");
    }
}

primitive_types3.rs

// primitive_types3.rs
// Create an array with at least 100 elements in it where the ??? is. 
// Execute `rustlings hint primitive_types3` for hints!


fn main() {
    let a = [0;100];

    if a.len() >= 100 {
        println!("Wow, that's a big array!");
    } else {
        println!("Meh, I eat arrays like that for breakfast.");
    }
}

primitive_types4.rs

// primitive_types4.rs
// Get a slice out of Array a where the ??? is so that the test passes.
// Execute `rustlings hint primitive_types4` for hints!!


#[test]
fn slice_out_of_array() {
    let a = [1, 2, 3, 4, 5];

    let nice_slice = &a[1..4];

    assert_eq!([2, 3, 4], nice_slice)
}

primitive_types5.rs

// primitive_types5.rs
// Destructure the `cat` tuple so that the println will work.
// Execute `rustlings hint primitive_types5` for hints!


fn main() {
    let cat = ("Furry McFurson", 3.5);
    let (name,age)/* your pattern here */ = cat;

    println!("{} is {} years old.", name, age);
}

primitive_types6.rs

// primitive_types6.rs
// Use a tuple index to access the second element of `numbers`.
// You can put this right into the `println!` where the ??? is.
// Execute `rustlings hint primitive_types6` for hints!

fn main() {
    let numbers = (1, 2, 3);
    println!("The second number is {}", numbers.1);
}